Update README.md

README.md

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-A total of 483 tabular datasets with meaningful column names used to pre-train TapTap. The last column of each dataset is the label column. Please refer to our paper https://arxiv.org/abs/2305.09696.
+This repository contains a total of 483 tabular datasets with meaningful column names collected from OpenML, UCI, and Kaggle platforms. The last column of each dataset is the label column. For more details, please refer to our paper https://arxiv.org/abs/2305.09696.